我在项目构建中遇到了像error: undefined reference to __imp__ZN12QApplicationC1ERiPPci'和error: undefined reference to __imp__ZN11QMainWindow11qt_metacastEPKc'这样的错误。我已经尝试过清理和重建，但没有任何效果。
我已经看到了许多关于这个错误的其他帖子，但没有修复方法工作.我是新的Qt creator，所以我可能错过了一些大的东西在这里，但我做了一个小部件项目.这里是文件：

main.cpp

#include "mainwindow.h"
#include <QApplication>
int main(int argc, char *argv[])
{
    QApplication a(argc, argv);
    MainWindow w;
    w.show();
    return a.exec();
}

字符串

主窗口.cpp

#include "mainwindow.h"
#include <QPushButton>
MainWindow::MainWindow(QWidget *parent)
    : QMainWindow(parent)
{
    setFixedSize(500,500);
    QPushButton myButton;
    myButton.setText("Hello world, this is a GUI app!!!");
}
MainWindow::~MainWindow()
{
}

型

mainwindow.h

#ifndef MAINWINDOW_H
#define MAINWINDOW_H
#include <QMainWindow>
class MainWindow : public QMainWindow
{
    Q_OBJECT
public:
    MainWindow(QWidget *parent = 0);
    ~MainWindow();
};
#endif // MAINWINDOW_H

型

myWindow.pro

#-------------------------------------------------
#
# Project created by QtCreator 2018-03-11T19:52:19
#
#-------------------------------------------------
QT       += core gui
greaterThan(QT_MAJOR_VERSION, 4): QT += widgets
TARGET = myWindow
TEMPLATE = app
# The following define makes your compiler emit warnings if you use
# any feature of Qt which has been marked as deprecated (the exact warnings
# depend on your compiler). Please consult the documentation of the
# deprecated API in order to know how to port your code away from it.
DEFINES += QT_DEPRECATED_WARNINGS
# You can also make your code fail to compile if you use deprecated APIs.
# In order to do so, uncomment the following line.
# You can also select to disable deprecated APIs only up to a certain version of Qt.
#DEFINES += QT_DISABLE_DEPRECATED_BEFORE=0x060000    # disables all the APIs deprecated before Qt 6.0.0
QT += sql #added because I found this to try and solve my problem, doesn't fix
SOURCES += \
        main.cpp \
        mainwindow.cpp
HEADERS += \
        mainwindow.h

型
我的Qt版本5.10.1，操作系统是Windows，编译器是MinGW 64。